Case Study Kim Is a Celebrated Author at the End of Her

Case Study
Kim is a celebrated author at the end of her life. On her deathbed she is visited by her protégé, Marco. Kim says that she feels a sense of fulfilment and completion looking back her on life, apart from one regret. She never published her favorite collection of essays, one that she has kept hidden for years. She tells Marco where to find the collection and asks him to promise that he will submit the essays (just as they are) to her publisher after she dies. He promises her that he will.
After Kim's death, Marco retrieves the collection of essays to fulfill his promise to Kim. When he reads them, he discovers that they are full of scandalous and shameful personal details about the lives of other famous authors, many of whom are still alive. Marco knows that if the collection is published, the people discussed in the essays will be publicly shamed and their reputations forever tarnished. He feels unsure about whether to send the essays to Kim's publisher after all.
-What duties are in conflict in Marco's ethical dilemma? Is there any way for him to simultaneously honor the conflicting duties?